For the Winbond SPI flash devices. There are separate to 2 type devices.
Default QE(Quad Enable) bit disabled->SG naming is W25Q128JV.
Default QE(Quad Enable) bit enabled->SG naming is W25Q128JV-Q.
The default Status Register-2 (Bit 2=QE bit will be 1 and can't be reset to 0).
Therefore, the SR-2 will read back as 02.
Please make sure your part number then choose the corresponding algorithm for programming.
![](https://static.wixstatic.com/media/a27d24_f16b84053ae142fbb13b58bdcddf0b0b~mv2.png/v1/fill/w_49,h_24,al_c,q_85,usm_0.66_1.00_0.01,blur_2,enc_auto/a27d24_f16b84053ae142fbb13b58bdcddf0b0b~mv2.png)
Maybe you have any solution ? Because I got the same problem ... Thanks.